<template>
  <div class="article-container">
    <!-- 导航栏 -->
    <van-nav-bar
      class="page-nav-bar"
      left-arrow
      title=""
      @click-left="$router.go(-1)"
    ></van-nav-bar>
    <div class="main-wrap">
      <!-- 加载中盒子 -->
      <div v-if="isLoading" class="loading-wrap">
        <van-loading color="#3296fa" vertical>加载中</van-loading>
      </div>
      <!-- 加载完成盒子-文章详情 -->
      <div v-else-if="articles.title" class="article-detail">
        <!-- 文章标题 -->
        <h1 class="article-title">{{ articles.title }}</h1>
        <!-- 用户信息 -->
        <van-cell class="user-info" center :border="false">
          <van-image
            class="avatar"
            slot="icon"
            round
            fit="cover"
            :src="articles.aut_photo"
          />
          <div slot="title" class="user-name">{{ articles.aut_name }}</div>
          <div slot="label" class="publish-date">
            {{ articles.pubdate | relativeTimes }}
          </div>
          <!-- 关注按钮子组件 -->
          <UserFloowed
            :userId="articles.aut_id"
            v-model="articles.is_followed"
          />
          <!--
            :isFollowed="articles.is_followed"
            @followed="articles.is_followed = !articles.is_followed"

            v-model="articles.is_followed"
            v-model 什么时候用  ?  既要传数据,子组件还要修改数据
            会解析成两个 =>
            1个属性  :value = "articles.is_followed"        像子组件传值
            1个事件  @input = "articles.is_followed =$event" 触发事件 事件对象赋值给该值
            -->
        </van-cell>
        <!-- 文章内容 -->
        <div
          class="article-content"
          v-html="articles.content"
          ref="content"
        ></div>
        <van-divider>正文结束</van-divider>
        <!-- 文章评论子组件 -->
        <ArticleComment
          :source="articles.art_id"
          @updatetotal="totalCount = $event"
          :list="list"
          @click-reply="clickReply"
        />
      </div>
      <!-- 加载失败盒子：404 -->
      <div v-else-if="isError === 404" class="error-wrap">
        <van-icon name="failure" />
        <p class="text">该资源不存在或已删除！</p>
      </div>
      <!-- 加载失败盒子：其它未知错误（例如网络原因或服务端异常） -->
      <div v-else class="error-wrap">
        <van-icon name="failure" />
        <p class="text">内容加载失败！</p>
        <van-button class="retry-btn" @click="loadArticleInfo"
          >点击重试</van-button
        >
      </div>
    </div>
    <!-- 底部区域 -->
    <div v-if="articles.title" class="article-bottom">
      <van-button
        class="comment-btn"
        type="default"
        round
        size="small"
        @click="isShowCommentPopup = true"
        >评论</van-button
      >
      <van-icon name="comment-o" :badge="totalCount" color="#777" />
      <!-- 收藏按钮子组件 -->
      <ArticleCollected
        v-model="articles.is_collected"
        :artId="articles.art_id"
      />
      <!-- 文章点赞子组件 -->
      <ArticleLikings v-model="articles.attitude" :artId="articles.art_id" />
      <van-icon color="#777" name="share"></van-icon>
    </div>
    <!-- 弹出层 -->
    <van-popup v-model="isShowCommentPopup" position="bottom">
      <!-- 文章评论弹出层子组件 -->
      <ArticlePost :target="articleId" @onCommentPost="commentPost" />
    </van-popup>
    <!-- 弹出层 -->
    <van-popup
      v-model="isShowReplyCommentPopup"
      style="height:100%"
      position="bottom"
    >
      <!-- 评论回复弹出层子组件 -->
      <ReplyPost
        :comment="comment"
        @showPost="isShowReplyCommentPopup = false"
        v-if="isShowReplyCommentPopup"
      />
    </van-popup>
  </div>
</template>

<script>
import { getArticleInfo } from '@/api/article.js'
import { ImagePreview } from 'vant'
import UserFloowed from '@/components/user-followed'
import ArticleCollected from './components/article-collected.vue'
import ArticleComment from './components/article-comment.vue'
import ArticleLikings from './components/article-likings.vue'
import ArticlePost from './components/article-post.vue'
import ReplyPost from './components/reply-post.vue'
export default {
  name: 'ArticleIndex',
  components: {
    UserFloowed,
    ArticleCollected,
    ArticleComment,
    ArticleLikings,
    ArticlePost,
    ReplyPost
  },
  props: {
    // 路由参数文章ID
    articleId: {
      type: String,
      required: true
    }
  },
  data () {
    return {
      // 文章详情数据
      articles: {},
      // 加载状态
      isLoading: false,
      // 404状态
      isError: 0,
      // 评论总数
      totalCount: 0,
      // 文章评论弹出层显隐
      isShowCommentPopup: false,
      // 文章评论数据
      list: [],
      // 评论回复弹出层显隐
      isShowReplyCommentPopup: false,
      // 单项评论数据
      comment: {}
    }
  },
  created () {
    this.loadArticleInfo()
  },
  methods: {
    // 获取文章详情
    async loadArticleInfo () {
      try {
        this.isLoading = true
        const res = await getArticleInfo(this.articleId)
        this.articles = res.data.data
        this.isLoading = false
        this.$nextTick(function () {
          this.previewImg()
        })
        // setTimeout(() => { this.previewImg() }, 0)
      } catch (err) {
        // 失败显示404盒子
        if (err.response && err.response.status === 404) {
          this.isError = 404
        }
        this.$toast('获取失败')
        this.isLoading = false
      }
    },
    // 点击图片预览
    previewImg () {
      console.log(this.$refs.content)
      const img = this.$refs.content.querySelectorAll('img')
      const images = []
      img.forEach((item, index) => {
        images.push(item.src)
        item.onclick = () => {
          ImagePreview({
            images,
            startPosition: index
          })
        }
      })
    },
    // 发布评论
    commentPost (obj) {
      // obj.is_liking = false
      this.isShowCommentPopup = false
      this.list.unshift(obj)
      this.totalCount++
    },
    // 孙子传值
    clickReply (e) {
      console.log(e)
      this.comment = e
      this.isShowReplyCommentPopup = true
    }

  }
}
</script>

<style scoped lang="less">
.article-container {
  /deep/ .van-button--normal {
    padding: 0;
  }
  .main-wrap {
    position: fixed;
    left: 0;
    right: 0;
    top: 92px;
    bottom: 88px;
    overflow-y: scroll;
    background-color: #fff;
  }
  .article-detail {
    .article-title {
      font-size: 40px;
      padding: 50px 32px;
      margin: 0;
      color: #3a3a3a;
    }

    .user-info {
      padding: 0 32px;
      .avatar {
        width: 70px;
        height: 70px;
        margin-right: 17px;
      }
      .van-cell__label {
        margin-top: 0;
      }
      .user-name {
        font-size: 24px;
        color: #3a3a3a;
      }
      .publish-date {
        font-size: 23px;
        color: #b7b7b7;
      }
      /deep/ .follow-btn {
        width: 170px;
        height: 58px;
        .van-loading__spinner {
          width: 16px !important;
          height: 16px !important;
        }
      }
    }

    .article-content {
      padding: 55px 32px;
      /deep/ p {
        text-align: justify;
      }
    }
  }

  .loading-wrap {
    padding: 200px 32px;
    display: flex;
    align-items: center;
    justify-content: center;
    background-color: #fff;
  }

  .error-wrap {
    padding: 200px 32px;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    background-color: #fff;
    .van-icon {
      font-size: 122px;
      color: #b4b4b4;
    }
    .text {
      font-size: 30px;
      color: #666666;
      margin: 33px 0 46px;
    }
    .retry-btn {
      width: 280px;
      height: 70px;
      line-height: 70px;
      border: 1px solid #c3c3c3;
      font-size: 30px;
      color: #666666;
    }
  }

  .article-bottom {
    position: fixed;
    left: 0;
    right: 0;
    bottom: 0;
    display: flex;
    justify-content: space-around;
    align-items: center;
    box-sizing: border-box;
    height: 88px;
    border-top: 1px solid #d8d8d8;
    background-color: #fff;
    .comment-btn {
      width: 282px;
      height: 46px;
      border: 2px solid #eeeeee;
      font-size: 30px;
      line-height: 46px;
      color: #a7a7a7;
    }
    /deep/ .van-icon {
      font-size: 44px;
      .van-info {
        font-size: 16px;
        background-color: #e22829;
      }
    }
  }
}
</style>
